Post miscarriage

Charity

I had a miscarriage September 2015, my husband and I have been TTC since I was able. We tried keeping track of ovulation and fertile period for about a year before we would become frustrated and sex became a chore almost. We decided to relax, and let whatever happen, happen. But nothing has happened unfortunately. I'm 26, I turn 27 in October. Any words of advice? TTC for roughly 1.5 years post miscarriage. When should you seek medical advice as far as fertility goes?